hey 2k4, is your dmax an allie cc shortie or what? I just got rid of mine...tired of puttin $100.00 each week in it just to commute to work, way too much truck for a grocery getter. I have the crappy skimmer blues too. When I have my hand (arm) in the tank to do anything it usually takes a while until the skimmer produces bubbles again. Check to see if your air tube is sucking air...it might be clogged. Like someone said earlier, open the air valve all the way and get plenty of air in it then close it down slowly. Has your pump come unhooked? Mine blew itself off the inlet pipe once.